It’s the first time since the Playhouse’s site-specific “Without Walls” series was launched in 2011 that a show has been extended before it actually opened.

“Accomplice,” which begins previews March 26, now has additional performances from 4:30 p.m. to 7 p.m. April 16-19 (starting every 30 minutes within that time window), and 1 p.m. to 5 p.m. April 20-21 (same 30-minute interval between performances).

There also are newly added Tuesday-Wednesday performances (April 2-3 and 9-10), again starting every 30 minutes between 4:30 p.m. and 7:30 p.m.

“Accomplice,” a kind of mystery stroll that will involve playgoers in a shady (fictional?) crime scheme as they make their way around the Little Italy neighborhood, was previously scheduled to close April 14.

The New York Times has compared previous editions of the piece to the Michael Douglas movie thriller “The Game.” (Which probably is better than, say, “Lost.”)

The collaborative San Diego troupe Circle Circle Dot Dot never quite seems to stop moving — and we mean that pretty literally. Their last show was “San Diego, I Love You,” which, like “Accomplice,” involved telling playgoers to take a hike (in this case to various locations in Hillcrest).

Now C2D2 already is getting set to roll out its next show — and again, we mean that pretty literally. (We just can’t seem to figure this figurative thing.)

The show is called “Derby Wise,” and it looks at the sport of roller derby through the eyes of Erika “Jezebel” Simms, a member of the San Diego Derby Darlings.

The company’s artistic director, Katherine Harroff, wrote the play. She and company member Shaun Tuazon are co-directing its maiden production — a fitting description, given its all-female cast.

The show goes off April 6 at the Tenth Avenue Theatre downtown, and runs through April 20. Details: circle2dot2.com.

And one more newly announced show: An event that also has its site-specific angle.

Vantage Theatre, the longstanding (although only occasionally producing) local company that teamed with San Diego Rep and La Jolla Playhouse in 2011 on the local presentation of Anna Deavere Smith’s “Let Me Down Easy,” is partnering on a play about Mozart.

Vantage, along with Mainly Mozart and the Timken Museum of Art, will present a staged reading of “Cadenza: Mozart’s Last Year” as part of the Mainly Mozart Festival.

The reading of Robert Salerno’s play, which dramatizes the great composer’s confrontation with mortality, takes place at 7 p.m. May 25 at the Timken in Balboa Park, with a champagne reception afterward.